Sharpener for rotary cutters



ME, BURTON; {$H1WPENER FOR ROTARY CUTTERS- APPLICATION man mm. 8.11921."

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@Be 1t known that l, GEORGE E. BURTON; tlvCllJlZBI1=Qli the United States, residing at i a Philadelphia, in the county of Philadelphia and State of Pennsylvania; have, invented new and useful Improvements in "Fsharpeners ior Rotary Gutters, of which theifollowing "lea specification. it i i a cuttersfloi? pencil sharpener-s of the iDexter and other well known types of a such nature may: belregronnd or be sharp ened whenever" desired. i g: Another-obj ectof my invention is to a vide a novel devicewhich can be promptly gpositioned on1a rotarycutter pencil sharpfenerwby an inexperienced person and the cutters reg-round or sharpened by simplyvrotating themachine as when pointinga pen ening rotarycutters and it hasfimore par, tlcular reference to a means whereby the Boston,

{This invention relates to devicefoi sharpcilor the like. i i

ment, andthat cannot easily get out of order a orjrenderedineffective.

3W 1 view ajswill later on become. moreapparent this description proceeds my invention A iurther object of this invention is to provide a novel sharpening means for row ftary cntterswhlch is simple andllnexpenslve to fconstruct, comprises but few parts which are capable of prompt assembly and adjustand other obj sets in W'th the foregoing consists essentially in the novelficonstruction,

combinations :andarrangments of parts hereinafter fully described, and more spe-v reference is a be had to theaccompanying sheet of explanatory drawings constituting apart of this specification and in which like characters of reference designate a the same or correspondinglparts in all the v ews;

p Figural is a sideview of a pencil sharps ener. of fBostonf type havingthe cover plied position thereon. a I

grinder attachmentas applied; a g

remoyedand with my cutter grinder in ape FigureZ is a front end elevation of Figure is an enlargedperspective view; of the grlnder attachment main frame.

a Figure 4. is an enlarged perspect velv ew (if one oi the grinder holders or shoes pend;

Figure 5 an enlarged perspectiveview structure.

supporting holder in which the pencil is (llSPOSGd during the operation of polntmg all'ofsaid parts beinginaccordance with the well known patterns and arrangements and being" only briefly referred to for a bet- ,terfunderstanding of my invention.

According to invention 1 form the main frame Figure from a sheet metal blank oi' suitable gauge or thickness which is subsequently tempered to the requisite degree; said frame 10 beingi'ashioned with a centrahaperture 11 01- a diameter to pass easily over the aioresaidstubular boss 9and out out orspac ed laterally-turned substan tially ii-shaped; spring arms 12 the free ends-whereof are coiled or turned over to const tute ournalsor h nge supports 13 for transversely CllSPOSBd wires or rods 14. The

saidirame 10 is also provided with diagonallyopposedoutstanding projections or ears 15 forabutment;against the cutter holder frame (of the standard 6 and as clearly shownin, Figure l and diametrically 0p posed lips or upset members 16 appropri; ately stampedout therefrom, and in addi tion thereto are diagonally aligned longitudinal parallel slots Hand pin holes 18 the purpose whereolfwill be more fully explained'. Mounted on the above referred to wires'or rods 1a are'holders or equalizer members 19s11itably made from sheet metal blanks and fashionedto provide a medial pivotal portion 20 and turned over ears or gripping members 21 betweenwhich the abrasive or other suitable material blocks opposed relation as will be clearlyunderstood hy those acquainted with the art to which this invention appertains. lt willof conrse bereadily recognized thatthe blocks 2:2 when secured in the equalizers or holders 22am securely clamped and supported in 19 are hingedly suspended in opposed relation on the wires or rods l t by means of the rolled or channeled medial parts 20; or said parts 20 may be secured to the rods or wires 14s and the latter be hingedly mounted or journaled in the coiled or turned over hinge supports 13. I

Slidably mounted on the outer face of the aforesaid main frame 10 are opposed spring influenced jaws 23 each of which is fashioned from a sheet-metal blank to provide a finger hold 24 at one end and a V-shaped cut-out at the opposed end flanked by outwardly turned flanges orparts 26, chamfered or tapered down at 27 to terminate in. or provide a notched end 28 for the purpose later on explained. Stamped out from each jaw 23 are spaced parallel tongues 29 which are passed through the aforesaid diagonal slots '17 the ends 30 being thereafter laterally turned whereby said jaws 2.3 are slidably mounted on the frame 10 in opposed relation andtadapted for movement towards or away from each other as will be clearly apparent to those acquainted with the art and on an examination of the drawings. In order that the jaws 23 may be normally influenced towards each other I preferably employ the means shown and which consists of a tempered steel recoil wire or spring 31. the free end whereof seats against the aforementioned notched end 28 of the outwardly turned flanges or parts 26, whilst the other end 32 is passed through the adjoin-- ing pin hole 18 and an intermediate part is passed under the aligning lip or upset latch member 16 whereby it will be clearly seen from Figure 2 that the said jaws 28 are spring influenced towards each other and forced into gripping engagement on the tubular boss 9. It is also to be remarked that the abrasive blocks 22- are made of a length to accommodate any length of ordinary rotary cutter 7 and wide enough to permit of a large surface for operating on said cutters whilst one or both ends 33 thereof may be beveled to allow close approach to the head of'thc standard 6 and thereby grind the full length of the said cutters. Obviously the hinging of the abrasive or other blocks 22 as set forth provides for their automatic adaptation to differently coned or angularly inclined cut--' ters 7.

In'use and assuming that the chip cover" or casing has been removed from the head of the standard 6, the jaws 28 are separated by expansive pressure exerted on the fingerholds 24 whereupon the device is slipped ti) into position as shownby Figure 1, that is wise direction or to the right-hand it will be self-evident that the rotary cutters 7 will be completely ground or iesharpcncd over their entire length by a simple opcration analogous to the ordinary operation of pointing a lead pencil crayon or the like.

From the foregoing description it will be clearly apparent that by my invention I have provided an extremely simple and very effective device for the purpose specified; and whilst there has been shown and fully described one practical embodiment thereof the same is not to be deemed as restricted thereto; as the invention susceptible of easy adaptation for other uses than the preci 7 form described, and the right is hereby reserved to make such changes. ViH'lili'lOHS and other adaptations thereof as fairly lie within the scope of the appended claims.

Having described my invention what I claim as new and desire to secure by l miter Patent is:

1. A sharpening device for rotary culters con'iprising a frame. flexibh and hin edly mounted opposed uhrading moans carried by saidfraine and means for supporting said frame and aln'ading means in operative position on the rotary cutters to be sharpened.

2. A sharpening device for rotary cutters comprising a frame, flexibly and hingcdlv mounted opposed abrading means carried by said frame, and opposed spring iuflucnced jaws for supporting said frame and abrading means in operative position on the rotary cutters to be shar iened.

3. A sharpening device for rotary cutters comprising a frame having pairs of later-- ally projecting -mced flexible arms the ends whereof are shioned to provide hinge bearings, abra-tling means hingcdly mounted in opposed relation betwecn the pairs of spaced flexible arms, and spring influenced means for supporting said frame and abrad- ,ing means in operative position on the rotary cutters to be sharpened.

4. A sharpening device for rotary cutters comprising a plate frame havinga cen tral aperture therein and pairs of laterally projecting S-shaped spring arms the free ends whereof are fashioned to provide hinge bearings, longitudinal abradmg members pivotally mounted in the hinge bearings between the pairs of spaced spring arms, and spring influenced means for supporting said frame and abrading members in stationarv position on the rotary cutters to be sharpened.

5. A sharpening device for rotary cut- 'ters comprising a plate frame having a central aperture therein and pairs of laterallv projecting S-shaped spring arms the free ends whereof are fashioned to provide hinge bearings opposed longitudinal :il n'ading blocks s-mpported by grippiilg members and ltlt) i ii lit)

a transverse hinge pin between the pairs of spaced spring arms, and spring influenced means for supporting said frame and abrading blocks in stationary positionbnuthe rotary cutters to be sharpened.

*6. A sharpening device; for 'otarycutf ters comprising aplate framehaving a central aperture therein, laterally extending diagonally opposed ears on one side and 1O palrs of projecting Q-Shaped spring arms the free ends whereof are fashioned to provide hinge bearings, opposed longitudinal abrading blocks supported by gripping members and a transverse hinge pin between the pairs of spaced spring arms, and spring influenced jaws slidable on the aforesaid frame for automaticallycentering the dervioe in stationary position on the rotary 3 cutters to be sharpened.

7. A sharpening deviceforrotary cutters comprlslng a plate frame having a central aperture therein, laterally entending diagonally opposedears on oneside and pairs of projecting S-shapedspring arms the free "ends whereof are fashionedto provide hinge 'bearings, opposedlongitudinal abrading blocks supported gripping members and a transverse hinge pin betvveen the pairs of Q spaced springflarms, manually expandible opposed javvs slidable. on the face the Faforesaid frame, and means" normally tend ing to force said jaws, towards the centre of the aforesaid central aperture.

8. In a sharpeningdevice for rotary cutters including abrading means and means for i supporting said device relative to the l cutters to'f be sharpened, the combina? ,tion of a mainor plate frame having a central aperture therein, laterally projecting diagonally opposed ears and integral pairsiof "opposed -shaped spring arms on said plate-frame the free ends whereof are fashioned to provide hingebean ings for the abrading means. v M9. In a sharpening device for rotary cutters including a mainframe and opposed spring influenced j ass for supporting said frame relative to the cutters tobe sharpened,

the combination of opposed resiliently and hingedly mounted abrasive holders, each of said holders comprising a plate member having a medial transverse hinge portion and fold-over ears for gripping the abrasive inner ends flanlredby'outset flanges and up posed finger holds, spaced tongues on said ters including a main frame having slots and jaws adapted for passage through theslots in the main frame whereby they are slidably mounted thereon, recoil means for normally forcing said jaws towards each other.

a 11,111 a sharpening device for rotary cutters including abrading means and spring influenced means for supporting i said device relative to the cutters to be sharpened,

the combination of a main orplate-frame having a central aperture therein, laterally projecting diagonally opposed ears out standing therefrom, integral pairs of op posed S-shaped spring arms laterally outstanding onthe same side as the opposed ears and having their free ends fashioned to proopposite face of the plate frame serving as tension members for the aforesaid spring influenced supporting means. i j i it a In testimony whereof I aflix my signature.

i GEQRGE E. BURTON. I

vide hinge bea'irings,'and outset lips on the 

